Edge-trimming machine



Feb. 14, 1928. 1,659,251

w. B. FAGAN EDGE TRIMMING MACHINE Filed-Sept. s, 1927 in shoes fitted with Patented Feb. 14,1928.

UNITED STATES PATENT oFF'IcEQ WIIJIjIA B, mean, or WAUWATOSA, isconsin/negation 2110 UNITED slion 'M Ae cnmniw CORPORATION, or earns-son, new JERSEY, A conronsrion or new JERSEY.

Application filed September This invention relates to machines for trimming the edges of the soles of shoes and more particularly to trimming the shank portions of the soles.

The usual procedure in trimming the edge of a sole is to trim the forepart with a rotary toothed cutter having one profile, and to trim the edges of the shank portion as far as possible to the rear with another rotary toothed cutter having a differenteproiile better suited to shank trimming. It is necessary, however, to end the shank trimming some distance in front of the breast of the heel to avoid damage to the latter, since if the trimming with a rotary cutter were continued-all the way heel it would be impossible to avoid nicking the heel. Consequently, when the shank trimming has progressed toward the heel to a point where it is no longer safe to cont nue thetrimming with a rotary cutter, the shoe is removed from the cutter. This leaves short untr'immed portions on the shank that project laterally beyond the sides of the heel and that require trimming by some other kind of a device so that the edges of the shank, where they meet the heel, will be flush with the sides of the latter. This final trinniiing of the shank is commonlytermed jointing, and itis particularly with this jointing problem that the present invention is oncei-ned. v e a In operating on a shoe, the heel of which has a breast face that is substantially per pendicula}: to the plane of the shank where the heel and shank meet, the jointing operation may be satisfactorily performed with jointing machines heretoforesupplied to the trade, but such jointing machines are not so well adapted to produce satisfactory joints Louis heels, the breasts of which curve sharply and merge into the bottom surfaces of the shanks.

Another problem is encountered in jointing womens McKay shoes. In shoes of this type the margin of the outsole is channeled to providea channel flap under which the outsole stitches are -concealed when the shoe is finished, the flap being laid back during the stitching operation and subsequently returned to its normal position and cemented to the marg n of the body of the'sole. More eve-r in womenfis turn shoes, as wellasin womens shoes of the McKay type, the may to the breast of the EDGE-TRIMMING MACHINE.

3, 1927. Serial No. 217,338.

gins of the shank of the outsole are usually margins in consequenc'eof its reduction in,

thickness, lateral pressure against the edges of these two elements tends to crumple them and sometimes actually ruptures the bond of cement between them.

In view of the problems herein ,above set forth anobject ofthe present invention is to provide improved apparatus adapted to perform a satisfactory jointingoperation on shoes the heels of which have breastv faces otherwise than substantially perpendicular to the'plane of the shank portions ofthe soles. To this end afeature. of the invention consists. in a machine comprising a re ciprocatory tool holder and a tool carried thereby and having two angularly related meeting surfaces one of which is arranged to bear against the marginal portion of the bottom surface of the sole while the other bears against the edge of the sole, the tool also having a series of kerfs intersectingthe' face that bears against the edge of the sole and dividing this faceinto teeth adapted to trim the edge of the sole with ascraping action. The said face that is arrangedto bear against the bottom surface of the sole is prefei'ablysmooth and functions not only as a guide to maintain the edge of the sole in the desired relation to the teeth but also braces the margin and thereby furnishes temporary rigidity to tithe material upon which the teeth are operating.

hen the above described tool is used to perform a jointing operation-on a sole the shank of which has been reduced in thickness at its margins the bracing effect referred to above is particularly advantageous but it is even more so when operating upon a shoe of the McKay type in that the smooth face that bears against the bottom of the sole min Ill] tains pressure of the channel flap against the marginal portion of the body o'l the sole. In this respect the described tool not only prevents distortion oi? the relatively thin mar iu oi the sole but it also 'n'cvents separation ol the channel flap 'l'rom the body ol the sole.

.lleterring to the drawings,

Fig. l. is a front elevation of aportion oi. a machine adapted to perform a jointing op elation, said machine being equipped with a jointin tool embodyng the novel features (it the present invention;

Fig. 2 is a side elevation of said tool and a portion of a reciprocatory holder by which it is supported and operated. the outline of a shoe being represented in dotted lines;

Fig. 3 is a view similar to Fig. 2 but on a larger scale, and represents the shoe in crosssection, the plane of the section intersecting the shank of the shoe close to the breast oi the heel;

Fig. t is a perspective view incl riding an outsole and a Louis heel but omitting the upper or hodyot the shoe to illustrate the condition of the sole that requires the socalled jointing operation;

Fig. 5 is a front elevation oi the jointing tool illustrated in Figs. 1, 2 and 3:

Fig. 6 represents a portion of said tool on a larger scale;

Fig. 7 represents the said tool as viewed in the direction indicated by an arrow in Fig. 3; and

Fig. h is a perspective View ol said tool as viewed from one side.

The general organization of the mcchanism illustrated in Fig. 1 is similar to that of a well-known type of edgesetting ma chine which has proved to be satisfactory for performing a jointing operation when equipped with a tool embodying the novel features of the present invention. Said ma chine, so far as it is here shown, con'ipriscs a frame 10 in which a high-speed rotary shall 12 is iournaled. A. wrist pin l-lprojecting 'l'oruroiu: cud ol said shaft operates a connecting rod 16 by which a. lever 18 is oscillated about. a center indicated by a dotted circle :20. This lever is provided with a reversible tool-holder 22 from which two cylindrical sluts project. but for the purpose of the present invention either oi the studs :Z-lis suflicient to hold the jointing tool :26 hereinafter described.

The tool 226 is made of steel and hard cnc'l to give it durability. it is, in some re. spccts. similar to tools commonly provided for edge-setting but ditl'ers from edge-setling tools in that it is provided with a series of teeth 28 each. adapted to trim, with a scraping action, some of the surplus material from the edge of the sole of a shoe. The tool 96 is provided with a cylindrical socket 30 (Fig. 5) adapted to receive a stud 2tprojecting from the holder A notch (Figs. 7 and 8) is formed in one end of the tool to receive a key or pin 3% projecting from the holder the tool being thus prevented from turning relatively to the stud 24-. The holder 2 is provided with a springdclcnt so. and the tool 2U provided with a notch or depression 38 adapted to receive said dctcnt, so that vvhcn the tool is :lorrcd home relatively to the holder E22 it will he maintaiucdby the detent in interlocked relation with the stud Z-l; and the pin 2-H and still be capable of being detached by a slight pull away from the holder.

The tool 26 is formed with a smooth surface 4o arranged to bear against the bottom surface of the shank 4-2 of the solo ol a shoe, this surface til being preferably con vex as shown in Figs. 7 and H. The tool also provided with a shoulder ll, (Figs. 53 and 3) which projects from the surface all substantially at right angles to the latter to engage the edge of the sole. The shoulder a-i is also ireterably convex, as illustrated in Figs. :3 and (3, although in these figures it is divided into the teeth :28 by a series ot parallel saw kcrfs at the bottoms of which are flush with the surl'ace i0 (Figs. T and 8). Thus, each tooth 28, where a kerf J ll intersects the shoulder -i--l, is provided "with a sharp acute-angular edge 4.8. Some of the edges 48 are ar 'anged to trim or scrape the edge ot the sole when the tool moves transversely of the kcrfs in one direction and the others are arranged to have the same eli'ect when the tool moves in the opposite direction. The double pointed arrow in I ig. 6 indicates the directions and approximately the amplitude of the motions imparted to the tool by the lever 18, these motions being curvilinear by reason of the angular motion of the lever about the centcr 20.

Fig. l is not intended to ieprcsent the actual condition of a. shoe in process of: manufacture, since the upper or body of the shoe is omitted theretrom, and it will, there fore, be understood that in actual practice the sole and heel are both attached to a shoe. and that the upper is omitted from the figure merely for the sake of showing to better advantage the untrinnned prrriccting portions 50, ti l remainii'ig on the shank l: is a result of partially trimming the edges ol the shank with a rotary cutter according to common practice. The purpose of the tool 2-6 is to trim oil the uutriunned portions :70, 50 back to the dotted lines 52 so that the edges of the shank will merge into, and be flush with, the sides 54 of the heel.

In womens turn shoes the margin of the sole is considerably reduced in thickness throughout, whereas in womens McKay shoes it is common practice to reduce the thickness of the margins of the shank of the outsole to produce the appearance of light ill!) to bend or crumple the edge.

ness. Consequently, when the partially trimmed shank of either of thesetypes of sole is presented to the jointing tool 26, the pressure against the edge of the shank tends lvloreover, in shoes of the McKay type, as shown in Fig. 3, the margin of the outsole is further weakened by cutting it to provide a channel to receive the stitches 56 that connect the outsole, the insole 58 and the upper (30. Although the channel flap 62 is cemented to the thin marginal portion 64: of the shank before the edge is trimmed, these parts, if bent or crumpled, would burst their bond of adhesion. Still, whatever the margin of the shank lacks of stiffness in consequence of be ing relatively thin where the surplus material lies, it is reinforced by the surface of the tool 26 while the latter is operatin This surface, when held against the bottom of the margin of the shank, braces the latter against bending and crumpling, its area of contact with the margin being contiguous to the point at which the teeth 28 press agalnst the edge of the shank.

In addition to bracing the margin of the hank, the surface 40, when bearing against the channel flap 62 of a McKay sole, presses the flap against the margin 64;. This not only prevents separation of the flap and the margin 6st but also closes any crack that may have been left between them. At the same time the rubbing action of the surface 40, due to vibration of the tool, smooths the channel flap and causes closer adhesion of the latter to the margin 64;.

The operation of cutting the kerfs 46 produces burrs on the operating edges 48, and these burrs increase the trimming effectiveness of the tool 26. Thereafter, when the edges e28 become dull from use, they may be readily sharpened and new burrs formed by filing the sides of the teeth with a thin flat l'ile inserted in the kerfs.

Having described my invention, What I claim as new and desire to secure by Letters Patent of the United States is 1. A machine for operating on the edge of the sole of a shoe, comprising a reciprocatory tool having two angularly related meeting faces one of which is arranged to bear against the marginal portion of the bottom surface of the sole while the other bears against the edge of the sole, and having a series of kerfs intersecting said other face and dividing the latter into teeth adapted to trim said edge with a scraping action, and

means arranged to reciprocate said tool tranvsersely of said kerfs.

A tool for performing a jointing oper ationon the shank portion of the sole of a shoe, having a smooth integral surface ar ranged to bear against the marginal portion of the bottom surface of the shank, a shoulder arranged to bear against the edge of the shank, and a series of kerfs intersecting said shoulder and dividing it into teeth adapted to trim oil the surplus material witl a scraping action.

3. A tool for performing a jointing operation on the shank portion of the sole of a shoe, having a smooth and slightly convex surface arranged to bear against the marginal portion of the bottom surface of the shank, a shoulder projecting from said smooth surface in substantially perpendicular relation thereto, said shoulder having a series of parallel kerfs by which it is divided into teeth, the bottoms of said kerfs being substantially flush with said smooth surface, and said teeth being arranged to trim surplus material from the edge of the shank with a scraping action when-the tool is reclprocated transversely of said kerfs.

i. A tool for performing a jointing operation on the shank portion of the sole of a shoe, having a slightly convex shoulder adapted to engage the edge of the shank, a series of parallel saw-kerfs intersecting the work-engaging surface of said shoulder and dividing the latter into teeth adapted to trim the surplus material from said edge with a scraping action when the tool is reciprocated transversely of said kerfs, and a smooth portion projecting from the bases of said teeth to engage the marginal portion of the bottom of the shank and thereby brace said marginal portion against crumpling.

5. A tool for performing a jointing operation on the shank portion of the sole of a shoe, having a smooth surface arranged to bear against the bottom of the marginal portion of the shank, and a convex shoulder projecting from said smooth surface to bear against the edge of the shank, said shoul der being intersected by a series of parallel kerfs dividing it into teeth and forming a series of acute-angular edges that stand up from said smooth surface to trim or scrape the edge of the shank when the tool is reciprocated transversely of said kerfs.

In testimony whereof I have signed my name to this specification.

WILLIAM B. FAGAN. 

